Effective Removal of Tetracycline by Using Bio-Templated Synthesis of TiO2/Fe3O4 Heterojunctions as a UV–Fenton Catalyst
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Novel maize-straw-templated TiO2/Fe3O4 hierarchical porous composites were synthesized by high-temperature calcination followed by a hydrothermal process. The composites were demonstrated to be efficient heterogeneous catalysts for the UV–Fenton-like degradation of TC. The results show that the as-prepared TiO2/Fe3O4 catalysts retain the original pore morphology of the maize-straw material, and a large amount of Fe3O4 particles are attached to the TiO2 surfaces. The as-prepared TiO2/Fe3O4 heterojunctions have abundant interfacial boundaries, which greatly improve the migration of photoexcited charges across different components. Consequently, in the UV–Fenton system, the TiO2/Fe3O4 catalysts exhibit significant activity towards the degradation of TC (50 mg/L) in a wide pH range. In particular, a maximum mineralization and TC removal of 98% is achieved within 60 min at pH 7.0, which is much higher than that of traditional Fe3O4-based UV–Fenton (81%) and TiO2 photocatalysis (23%). The enhanced degradation and mineralization of tetracycline is attributed to the efficient reduction of Fe3+ to Fe2+ by photo-generated electrons from the TiO2 skeleton of the TiO2/Fe3O4 heterojunction.
KeywordsTiO2/Fe3O4 heterojunction Biotemplated UV–Fenton Tetracycline degradation
The authors thank the National Natural Science Foundation of China (Grant No. 61774073) for financial support for the project. Many thanks should be given to Yu Gao for his technical help in chemical analysis.
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Conflict of interest
The authors declare that they have no conflict of interest.